Question

5x+3y=12
4x+2y=5 eliminación

Answer 1

5x + 3y = 12 4x + 2y = 5

4x + 2y = 5
4x = 5 - 2y

5x + 3y = 12 
x + 5 - 2y + 3y = 12
x + y = 7
x = 7 - y

4x + 2y = 5
4(7 - y) + 2y = 5
28 - 4y + 2y = 5
23 = 2y
23/2 = y

x = 7 - y
x = 7 - 23/2
x = - 9/2